An autistic teenager was discovered gagged, tied and with his pants around his feet by his teacher as he became the victim of a horrible school bullying attack last week.

The 18-year-old from Croydon Special Developmental School, in eastern Melbourne, was reportedly found in the toilet cubicle with crepe wrapped so tightly around his wrists that it left a mark.

And now his grandmother has hit out at the school, outraged she wasn't immediately called to come and pick-up the boy, who suffers with non-verbal autism meaning he has very limited speech, last Monday morning, the Leader reports.

An autistic teenager from Croydon Special Developmental School (pictured), in Melbourne, was discovered gagged, tied and with his pants around his feet in the toilet by his teacher - the victim of a horrible school bullying attack last week

Despite the 'distressing' incident occurring shortly after 9am on Monday, the boy's grandmother said she wasn't notified until more than an hour-and-a-half later.

'I phoned the school straight away and was told the details but they tried to discourage me from picking him up,' she said.

'They said my grandson was perfectly fine and that it was better for him to stay in class and stick to his usual routine.'

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When she finally did get a call from the school, she arrived to find her grandson in a 'bad place' and very 'agitated'.

While the school has reportedly confirmed the incident, it has not yet taken the step of removing the offending student from classes.

And that's much to the anger of the boy'd grandmother, who believes more incidents may have occurred that have gone unnoticed.

The 18-year-old was reportedly found in the toilet cubicle with crepe bandages wrapped so tightly around his wrists that it left a mark, leaving his grandmother outraged she wasn't immediately called to come and pick-up the boy

'There have been several incidents over the past month where he was coming home with his underwear ripped to shreds,' she said.

She said her grandson had been acting out of the ordinary for the past year, but that the school had yet to act.

In a letter sent from Croydon SDS just two days after the incident, principal Elizabeth Anderson said she was 'taking the matter very seriously'.

Police are reportedly investigating the incident, with Ms Anderson telling the boy's grandmother that while their enquiries remained ongoing she would not notify the remaining school community.